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/*****************************************************************
 *   Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 ****************************************************************/
package org.apache.cayenne.modeler.graph.action;

import java.awt.event.ActionEvent;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import javax.imageio.ImageIO;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;

import org.apache.cayenne.modeler.Application;
import org.apache.cayenne.modeler.graph.DataDomainGraphTab;
import org.apache.cayenne.modeler.pref.FSPath;
import org.apache.cayenne.modeler.util.CayenneAction;
import org.apache.cayenne.modeler.util.FileFilters;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jgraph.JGraph;

/**
 * Action for saving graph as image
 */
public class SaveAsImageAction extends CayenneAction {
    private static final Log logObj = LogFactory.getLog(SaveAsImageAction.class);
    
    private final DataDomainGraphTab dataDomainGraphTab;
    
    public SaveAsImageAction(DataDomainGraphTab dataDomainGraphTab, Application application) {
        super("Save As Image", application);
        this.dataDomainGraphTab = dataDomainGraphTab;
        setEnabled(true);
    }
    
    @Override
    public String getIconName() {
        return "icon-save-as-image.png";
    }
    
    @Override
    public void performAction(ActionEvent e) {
        // find start directory in preferences
        FSPath lastDir = getApplication().getFrameController().getLastDirectory();

        // configure dialog
        JFileChooser chooser = new JFileChooser();
        chooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
        lastDir.updateChooser(chooser);
        
        chooser.setAcceptAllFileFilterUsed(false);
        
        String ext = "png";
        chooser.addChoosableFileFilter(FileFilters.getExtensionFileFilter(ext, "PNG Images"));
        
        int status = chooser.showSaveDialog(Application.getFrame());
        if (status == JFileChooser.APPROVE_OPTION) {
            lastDir.updateFromChooser(chooser);
            
            String path = chooser.getSelectedFile().getPath();
            if (!path.endsWith("." + ext)) {
                path += "." + ext;
            }
            
            try {                
                OutputStream out = new FileOutputStream(path);
                
                JGraph graph = dataDomainGraphTab.getGraph();
                BufferedImage img = graph.getImage(null, 0);
                
                try {
                    ImageIO.write(img, ext, out);
                    out.flush();
                }
                finally {
                    out.close();
                }
            }
            catch (IOException ex) {
                logObj.error("Could not save image", ex);
                JOptionPane.showMessageDialog(
                        Application.getFrame(),
                        "Could not save image.",
                        "Error saving image",
                        JOptionPane.ERROR_MESSAGE
                );
            }
        }
    }
}